Question: What PWN internet service has the greatest number of records?
Paraphrase: What PWN web benefit has the most prominent number of records?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q55387247 . ?ent wdt:P4876 ?obj . ?ent wdt:P31 wd:Q55387247 } ORDER BY DESC(?obj)LIMIT 5 
Answer: Great orthographic dictionary, Słownik języka polskiego, Słownik Języka Polskiego PWN online